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Vol. 162, Issue 1, January 2014, pp. 266-272




Evaluation of the Conductivity and Permeability of Rotor Shaft Material through Electrical Runout Using FEM

1 Wang Yifeng, 2 Cao Yanlong, 2 Chen Xiaolong, 2 Yang Jiangxing, 3 Hu Xiaoqi

1 Zhejiang University of Science and Technology, Hangzhou, 310023, China
2 Institute of Advanced Manufacturing Engineering, Zhejiang University, Hangzhou, China
3 Lishui University, Lishui, China
1 Tel.: 0571-85070220, 2 tel.: 0571-87953198

E-mail: 163hzw@163.com, sdcaoyl@zju.edu.cn


Received: 12 November 2013 /Accepted: 9 January 2014 /Published: 31 January 2014

Digital Sensors and Sensor Sysstems


Abstract: Material electromagnetic anisotropy of revolution parts poses a potential hazard to the operation of rotary machine (such as rotor) and interferes the vibration monitoring. The maldistribution of electromagnetic property of material is detected by eddy current sensor as electrical runout, which is necessary to be controlled in manufacturing process. In order to mitigate the uneven electromagnetic property of material easier, a new inversion method of evaluating the electromagnetic properties (the conductivity and permeability) of target material through electrical runout using Finite Element Method is proposed in this paper. A 2D axisymmetric finite element analysis model of eddy current sensor is established firstly. Then on the basis of analysis model, the relationship between electrical runout and conductivity & permeability is formulated. In addition, reference number is used to get another formula about electromagnetic property. In this way the conductivity and permeability can be obtained approximately from the electrical runout data by solving two simultaneous equations. As a result, the profiles of the variations of conductivity and permeability of target material are acquired with the method using the electrical runout data which were measured in experiment, which are instructive in retreating the defective revolution parts.


Keywords: Conductivity, Permeability, FEM, Electrical runout, Coil impedance, Eddy current sensor.


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